OPO波長可変レーザ磁気光学顕微鏡を用いた磁性フォトニック結晶ベース空間光変調器のピクセル評価

概要

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To evaluate magnetization process of pixels in magneto-optic spatial light modulators (MOSLMs) with one-dimensional magnetophotonic crystals (MPCs), a magneto-optic microscope composed of optical parametric oscillator (OPO) wavelength variable laser system was developed. The observation results show that the microscope is effective for accurate determination of magneto-optic rotation angle of samples exhibiting strong wavelength dependence, such as the case of MPCs, because of the very narrow wavelength width of the OPO laser system. The magnetization process of the MPC pixels was found to be unique, where tiny magnetic clusters change their direction almost irrespectively to each other, and the resultant pixel exhibit gray-scale color depending on the number of magnetic clusters whose magnetization switched its direction.